SpaceX has said the rocket will be capable of sending humans to Mars (though SpaceX has plans to build a different rocket/spaceship system for Mars travel, called the BFR).

It’ll also be the most powerful rocket currently in operation — and the one of the most powerful rockets ever built. The most powerful rocket in history was NASA’s Saturn V rocket, which was used for the Apollo moon landings and was retired in the 1970s.

The more thrust a rocket has, the farther it can travel and the bigger the payload — be it a satellite or spacecraft — it can send into orbit.

That opens up a whole new range of business opportunities for SpaceX, which has been leading a new era of spaceflight in which commercial companies — not just governments — are driving the industry forward.

For its first test mission, the Falcon Heavy will launch a dummy payload. Specifically, it’ll send a cherry red Tesla roadster from Musk’s personal collection into deep space. There’s no scientific reason to send the car to space. But it does serve as self-promotion for Musk, who is also the CEO of Tesla.

When asked on Twitter why he wanted to throw away a $100,000 car, he replied, “I love the thought of a car drifting apparently endlessly through space and perhaps being discovered by an alien race millions of years in the future.”

Once the Falcon Heavy has proven it can fly, the rocket can start doing its real job: sending satellites and other payloads into orbit.

The rocket is already signed up to carry three hefty telecommunications satellites into orbit — one each for Arabsat, a Saudi Arabia-based firm; Inmarsat, a British company; and Viasat, which is based in California.

The U.S. Air Force also plans to use a Falcon Heavy to launch a payload dubbed STP-2, which will include some weather forecasting satellites, later this year.

SpaceX also said in early 2017 that two space tourists put down a deposit to ride on a Falcon Heavy for a trip around the moon. At the time, SpaceX said that trip could occur in 2018, though the company hasn’t offered any updates recently.

How much does it cost?

The Falcon Heavy’s sticker price is $90 million, which is 45% more expensive than the Falcon 9, the rocket SpaceX has used for every mission going back to 2012.

But the Falcon Heavy is essentially three Falcon 9s strapped together, and it’ll boast about three times the thrust of the Falcon 9.

The Delta IV Heavy, which is built by United Launch Alliance and is currently the world’s most powerful rocket, reportedly costs more than $400 million per launch.

It should also be noted that the Falcon Heavy will out-power the Delta IV Heavy by a factor of two.

Why is it so cheap?

SpaceX says it’s been able to undercut the competition on price because of its reusable rocket parts.

The company is the only rocket builder in the world that’s safely returned first-stage rocket boosters — which provide the initial thrust at liftoff — back to Earth after launches to orbit.

The first Falcon Heavy mission will even use two refurbished boosters from previous Falcon 9 missions.

And, in what promises to be a stunning spectacle, SpaceX says it will attempt to guide all three of the Falcon Heavy’s first-stage boosters back to Earth after launch. Two of them will make a synchronized landing back at Kennedy Space Center. The third booster will land on a droneship, which is a remote controlled platform that catches rockets out at sea.

Will it work?

SpaceX is taking its sweet time preparing for launch. The company said back in 2011 that the rocket would be ready in 2013. That target eventually moved to November 2017, then December. Now, SpaceX is finally readyto set a firm launch date.

But even with all that careful preparation, things could still go haywire.

“Falcon Heavy requires the simultaneous ignition of 27 orbital-class engines. There’s a lot that could go wrong there,” Musk said at a conference last year. “This is one of those things that’s very difficult to test on the ground…Real good chance that vehicle does not make it to orbit.”

A SpaceX rocket explosion has destroyed a launch pad before. In September 2016, a Falcon 9 rocket spontaneously erupted in flames and caused significant damage to a launch site at Cape Canaveral Air Force Station. It took more than a year to refurbish the pad.

The Falcon Heavy is ready to fly from Kennedy Space Center’s historic Launch Complex 39A. That pad hosted Apollo and Space Shuttle missions going back to the heyday of human spaceflight.